SM5-EQ-PRO Microphone kit Instructions
The SM5-EQ-PRO is a professional grade, Microphone and, DVR-I/P camera, recorder interface designed for use in
acoustically difficult and sound quality critical environments such as interrogation and court rooms.
PCCM-1 Microphone Placement
Locate the PCCM-1 microphone as close as possible to the area of interest in the space to be monitored. Do not mount
the microphone near air conditioning vents, light fixtures or electrical equipment. The PCCM-1 operates optimally 3-5 feet
away from the subject(s) to be monitored. The PCCM-1 is still useable in the range of 15-25 feet but is dependent on the
level of background noise in the area. Experimentation in the environment will determine what distances work best.
PACEQ-1 location and power
The PACEQ-1 interface box is designed to be placed near the DVR, I/P camera, PC or recorder. Once all settings are
made, the interface can be located out of view. All controls are recessed to reduce the possibility of accidental “bumping”
of settings. The PACEQ-1 requires a 120VAC power source within 3 feet of its location. If this is not possible in your
application, you can splice in up to 100 feet of 18 awg, 2 conductor cable to extend the distance between the AC power
source and the PACEQ-1.
Cable Run
Run a professional grade microphone type cable (preferred) or a 22 gauge, stranded, two conductor shielded cable
between the PACEQ-1
module and the PCCM-1 microphone. Keep the cable run distance at or under 500 feet and away
from AC power sources, light fixtures and electrical equipment.
See Figure 1 for connection diagram.
Microphone input
Connect the supplied PCCM-1 microphone per the wiring diagram in figure 1. Note- do not connect microphones to both
inputs at the same time. If using a microphone other than the PCCM-1, determine whether it is a powered or unpowered
type. If it is a powered type, flip the Phantom power switch on. Both inputs are balanced types.
Microphone preamp gain
To properly set the gain for a given microphone and environment, first turn the EQ off and place the “threshold” and
“compression” controls at full counter clock-wise. Set output level at 12 o’clock. Now set the gain for an average of 0db on
a VU meter with typical average sound levels occurring in the room. If you do not have a db meter on your equipment,
adjust the gain for a clear sounding signal using headphones.
Setting the PACEQ-1 equalizer levels (EQ switch in “On” position).
Setting an equalizer for the desired overall sound is a subjective topic. We recommend using headphones to evaluate the
sound quality. Start with setting all controls to the mid-point (flat= no gain or cut). We suggest you do this when the
desired sound source is present (people taking, being interviewed, etc.) Adjust each control clockwise and counter
clockwise to get a feel for how each band affects the overall sound. Keep in mind that the human voice resides
predominately in the 1Khz-6Khz range. To focus on these bands, the 60Hz, 150Hz, 400Hz and 10Khz controls can all be
turned full counter clockwise. The remaining 3 controls (1Khz, 2.5Khz and 6Khz) can then be adjusted for best sound
clarity and intelligibility. Note- turning any of the controls fully clockwise will produce noticeable amplifier noise (a hissing
sound). We have found the following settings to be most effective in reducing background noise and emphasizing the
human voice band: 60Hz, 150Hz, 400Hz, 10KHz full counter clockwise. 2.5Khz 12 O’clock position. 1KHz and 6KHz at 9
O’clock from full counter clockwise.
Setting the PACEQ-1 compressor / limiter (ALC Adjust) controls
A compressor limiter is a circuit designed to keep audio signals in a specific range of amplitude so that audio signals
supplied to head-end equipment and speakers are not overdriven causing uncomfortably high listener volume levels. A
compressor/ limiter also prevent signal distortion and amplifier clipping, when sound levels are high.
Setting a compressor/limiter for the desired overall sound is
also
a subjective topic. First, be sure to set microphone gain
as described earlier in these instructions. A good starting point is to set the output both “threshold” and “compression” at
